diff --git a/addons/payment/static/src/xml/payment_post_processing.xml b/addons/payment/static/src/xml/payment_post_processing.xml
index e3d29ab4888..4390439d88d 100644
--- a/addons/payment/static/src/xml/payment_post_processing.xml
+++ b/addons/payment/static/src/xml/payment_post_processing.xml
@@ -61,17 +61,17 @@
                     </label>
                     <span id="o_payment_summary_amount"
                           t-out="formatCurrency(amount, currency_id)"
-                          class="fs-4 fw-bold"
+                          class="fs-5 fw-bold"
                     />
                 </div>
                 <hr class="d-md-none m-0 text-300 opacity-100"/>
-                <div class="o_payment_summary_separator col py-3">
+                <div class="o_payment_summary_separator col py-3 text-break">
                     <label for="o_payment_summary_reference" class="d-block small text-muted">
                         Reference
                     </label>
                     <span id="o_payment_summary_reference"
                           t-out="reference"
-                          class="fs-4 fw-bold"
+                          class="fs-5 fw-bold"
                     />
                 </div>
             </div>
diff --git a/addons/payment/views/portal_templates.xml b/addons/payment/views/portal_templates.xml
index cbdc5c9a370..31092047c05 100644
--- a/addons/payment/views/portal_templates.xml
+++ b/addons/payment/views/portal_templates.xml
@@ -254,7 +254,7 @@
         -->
         <t t-set="options" t-value="options or {'widget': 'string'}"/>
         <hr t-if="include_separator" class="d-md-none m-0 text-300 opacity-100"/>
-        <div t-att-class="'col my-3'
+        <div t-att-class="'col my-3 text-break'
                           + (' o_payment_summary_separator' if include_separator else '')"
         >
             <label t-attf-for="o_payment_summary_{{name}}"
@@ -264,7 +264,7 @@
             <span t-attf-id="o_payment_summary_{{name}}"
                   t-out="value"
                   t-options="options"
-                  class="fs-4 fw-bold"
+                  class="fs-5 fw-bold"
             />
         </div>
     </template>